Spray Head Nozzles

The nozzle is the part of the sprinkler that actually disperses the water. Its construction determines the type of spray pattern.  As there are many types of nozzles, we thought its best to explain them individually to help you understand which one meets your requirements.

While all nozzles throw what is commonly thought of as spray in general terminology, the term “spray heads” is generally used in sprinkler irrigation to describe those nozzles that disburse a fixed, uniform pattern of spray over the area, which they cover. The same basic principles are used in nozzles for stationary, pop-up, and shrub spray heads.

 

Full Circle 

Almost all full circle or square pattern spray nozzles depend on a core or swirl plate inside which spins the water against the shape inner walls of the upper nozzle to produce the desired spray pattern. The way the water is passed out the nozzle is in the name, full circle head’s distribute water 360° continuously until the water is shut-off.

 

Part Circle

Part circle patterns are usually created through bouncing or baffling the water off a contoured or flat surface produced by the cut of a milling machine, a flat saw, or a combination of both. They are normally sold in increments of 10°, but other angles are available from different manufacturers. The volume of water discharged by the spray nozzle in relation to the area covered is relatively high, resulting in an average precipitation rate of approximately one inch per hour. For normal lawn areas, this rate is ideal, however it must be treated with caution where steep slopes are involved. This can be down to excessive run off, and the rapid application rate can lead to washing of the soil on slopes.

The spray is usually discharged as a fine mist, especially when the water pressure is high. It is worth considering however that this fine mist is prone to be effected by wind drift. If installing in an area where winds are constantly high, part circle nozzles that offer a flatter spray than normal should be considered, as when combined with placing the spray heads 10-20% closer than recommended for complete coverage, will overcome this problem.

 

Strip & Line Nozzles 

These nozzles are made in several types, all designed for the specific purpose of watering narrow lawn or bed areas. A slotted design is most common in the stationary head and usually consists of slots cut into the top of the body itself rather than a separate removable nozzle.

The most common of this specialty spray are ‘end-strips’ and ‘side-strips’, but other variations are available such as ‘centre-strips and ‘corner-strips’. All of these nozzles spray a long, but narrow pattern, allowing the system designer a solution where traditional fixed nozzles can’t get the job done due to the shape of the landscape.

 

Click here to view our selection of nozzles if you're a contractor, or here if you're a homeowner. 

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